package com.ysh.demo01;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/userServlet")
public class UserServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // 统一编码
        req.setCharacterEncoding("UTF-8");
        resp.setContentType("text/html;charset=UTF-8");

        // 1.获取请求参数
        String username = req.getParameter("username");

        try {
            Thread.sleep(100);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        // 2.判断姓名是否已经注册，写死了
        if ("zhangsan".equals(username)){
            // 已注册，响应一个内容
            resp.getWriter().write("<font color='red'>用户名已注册</font>");
        }else if ("".equals(username)){
            resp.getWriter().write("<font color='red'>用户名不能为空</font>");
        }else{
            resp.getWriter().write("<font color='green'>用户名可用</font>");

        }
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        this.doGet(req, resp);
    }
}
